Taper attachment



July 29, 1941. w. F. GROENE ETAL 2,250,633

TAPER ATTACHMENT Filed April 11, 1940 5 Sheets-Sheet 1 ATT RN'EY.

\LlklAM F. qRoeNE- July 29, 1941. w. F. GIIQOENE EI'AL PAPER ATTACHMENT Filed April 11, .1940 5 Sheets-Sheet 2 mu w. U

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m film W M Ma W July 29, 1941. w. F. GROENE EI'AL TAPER ATTACHMENT 5 *Shets-Sheet 5 Filed April 11. 1940 4 INVENTORS.

wlLLlAM F. GROENE BY QEORGE wwmnq \DCLQM M ATTORNEY.

Filed April .11, 1940 .ggumimu 5- Sheets-Sheet 4 INVENTORS. WILLIAM F. qaosns qeoaqe w- LUN\NG\- ATTORNEY.

Patented July 29, 1941 NTIIOFEICEK.

'TAPER ATTACHIVIENT William F. Greene an d George W. Luning, Cincinnati, Ohio, assignors to The R K. Le Blond Machine Tool Company,

4 Cincinnati, Ohio, a

corporation of Delaware a Application April 11, 1940, Serial No. 329,131

01} 82-17) This invention pertains to taper attachments U 6 Claims.

for engine and tool room lathes, which are adapted to turn tapered surfaces on work held in such lathes. Further, this invention pertains specifically to for actuating the carriage and cross slide in such a manner that tapered surfaces may be machined on the work pieces in the lathe.

This invention pertains to certain improvements in differentially operated taper attachments of a type as set forth in co-pending application Serial #228,279, filed September 3, 1938. It is one of the objects in this invention to arrange such a difierential taper attachment with a relatively long guide bar so as to increase the efiiciency of the differential operating mechanism in that the guide bar slide may be moved relatively more rapidly and a greater distance while at the same tim using a lesser angle of setting for the guide bar to thereby cut down the relative strain and side thrust on the lathe carriage mechanism during the cutting of relatively steep tapers.

It is also an object of this invention to provide a difierentially operated taper attachment with a relatively long guide bar, while at the same time providing mechanism whereby the guide bar may be utilized in direct connection with bed of the lathe, independent of the differential operating mechanism, when turning relatively small tapers so as to gain the full length and efliciency of the long taper bar during such relatively small taper turning.

Further features and advantages of this invention will be set forth in a brief description of the drawings in which:

Figure I is a transverse fragmentary section through a lathe carriage and cross slide mechanism on the line II of Figures II, III, and VI, incorporating the taper attachment arrangement of this invention.

Figure 11 is a plan view of the taper attachment shown attached to the rear of the carriage of the lathe arrangement shown in Figure I.

Figure III is a rear elevation of the taper attachment shown partly in section on the line lIIIII of Figures I, II, and IV. V

Figure IV is an enlarged end view of the taper attachment partly in section on the line IV-IV of Figures II, III, and VI.

Figure V is an enlarged detailed view of the clamping mechanism for locking the slide rack pinion shaft against rotation on the frame of the taper attachment.

' Figure VI is a section through the taper attaper attachments for such lathes tachment on the line VI-VI of Figures I, II, and IV. 7

Referring particularly to Figure I, the taper attachment l of this invention is shown applied to a typical engine lathe comprising the bed 2 upon which is slidably mounted the carriage 3 on the usual ways 4, 5, movement along the bed 2. Onmounted a suitable apron l for ment of the-carriage and cross slide 8 (when-not turnin tapers) slidably mounted on the usual clove tail ways 9 of the carriage. The usual compound rest It the tool post II and the tool holder l2 and cutting tool l3 are provided on the cross slide to operate on work rotated by the work spindle [4 of the headstock l5. The cross feed screw I6 is journaled against the carriage 3 is axial movement in the slidable block-ll, Figure IV, on the bearing portions I 8 and the thrust bearing I9, nice adjustment being maintained between this cross feed screw l6 and this block I! bymeans of the lock nuts. The other end of the cross feed screw I6 is provided with a splined end lta, Figure I, which-telescopically slides in and is driven by the pinion sleeve 2| journaled inthe lathe carriage in a, suitable bracket 22. This sleeve 2| has a pinion 23 which may be driven byv power from the'mechanism in the apron! when doing ordinary facing or cross cutting operations in the lathe. The sleeve 2|, may also be rotated manually by means of the ball crank handle 24, fixed on the outer end .of this sleeve 2|. The cross slide has the nut 25 fixed thereto and operatively engaging around the cross feed screw it. The cross slide 8 and cross feed screw 16, when the screw is not being rotated, can thus be bodily moved independent of the driving sleeve 2|. 7 This bodily movement of the cross slide 8 and crossvfeed screw It may be effected by axially moving the cross feed screw l6, but this is not wholly satisfactory because of the inherent back lash between thenut 25 and the cross feed screwrlfi relatively. axial movements of the screw relative to the cross slide in reversing the'axial movement of this screw. In order to draw bar 26, Figures I and IV is provided which is secured to the cross slide by suitable screws 21 and projects rearwardlyand lieson the top surface I'laof the block l1, having a slotted portion 26a extending each side the clamping bolt 28, which carries a clamping plate 29 resting on the top surface 26b of the clamping bolt bring the plate 28 may be locked down to 29 tightly against the draw bar elfecting -movepermitting shake and overcome this defect a 7 the draw bar 26 whereby 26 looking it in firm engagement with the block l'l so that no relative movement may be effected between this block I! and therefore the cross feed screw 16 and. the carriage and the cross slide of the lathe.

During ordinary turning or cross feeding work the locking screw 28 is released so as to permit free sliding movement of the draw bar 26 'rela-. tive to the blockl'l when the cross feed screw it is being rotated either by power through the pinion 23 or by the ball crank handle 24 in a manual operation. However when taper turning this screw 28 is locked firmly so as to bind the block l1 through the draw barfirmly to the cross slide of the lathe in order that movements effected in this block I1 by the taper attachment mechanism to be described will effect similar and positive motion in the cross independent of the cross feed screw it. The cross feed screw l6 performing no function during h ta ert it n in s p a a The block I! is guided between the surfaces 30 end 3| formed by the guide plates 32 fixed on t3. h 3. y. i ab e ws. h lo firii zies h ra ke i h er a h.- men by s ita c ws id se r t n theblocki] i staken care of by the anti-friction ell at n qllers- 6;.s it b v m u d n ecent i studs. c r ied. in h l ck 1.1 and rcll he a ns he su ace 38, F r s 111 and V1, o the blo To the middleof theblock l! is provided a here 39. in which isrotatively mounted the upwe rdly projecting portion 40 of the guide bar shoe 4 l an-d has a clearance bore 42, through which passes the crossgfeed screw 16. In the upper end of this projection 40 ismounted the clamping sc iew 28. for. locking the draw bar 26 to the member I1 as described. Upward movement of the portion 40. under the action of tightening the screw 231s prevented by engagement. of. the suriace 43eof. the: guide bar. shoe 4| against the under surface of the block H. The aper d conical hole.42 isprovided so as to permit iullrotative movementsof. the guide bar shoe 4| byrotation in the bore 3&- ior the complete range of; setting. ofwthe guide bar. 44 having the slot formed; by: the. faces. 45,. 4.6., and 41; Between these faces. 45 and 46; is snugly mounted the guide bar shoe 41 having the four rollers. 48 mounted on. the bifurcated end of. this guide bar. shoe 4;-l. In. order; toprovide firm. and snug en-. gagement of; these rollers 48. with the sides. 45 and 4.6..0f; the.- guidebar 4.4:, the ends of this guide shoe are provided with slots. 49. and one; end orthesev biiurcated ends is. provided with a set screw 50:,threaded through one of. the ends and toengagethe. other. end. in the slots 4.9. so that by. tightening. the set screws 50 these ends. will be. spread; apart 1 and thereby force the respective; rollers 48into snug and firm engagement with these. sides 45 and 4.6 of the guide bar 4.4. Thuswith this arrangement no shake or back lashcan enter the mechanism between the guide. bar 4.4;and the draw bar 26 of. the taper attachment when doing taper turning. Also when the taperattachment bar; is set parallel with the lathe; bed as-showninFi l Ie, II no shake will result in thememberl1 carrying the cross feed screw,- so; that when the tightening screw 28 is, released for the; ordinary operation of the lathe,v there-will; be no axial float in the cross feed rew. to-d s urh t e. more: action. of. this mber il l i itih th es l de "the; u e; attki -nh tahv ou t d on;

slide of the lathe I suitable pin 5|, Figures III and VI fixed in the taper attachment slide member 52. The usual set over mechanism 440, and clamping mechanism 44b is provided for the guide bar 44. The slide 52 is carried on the anti-friction roller bearings 53 appropriately mounted on eccentric studs 54 carried in the bracket l of the taper attachment. The slide 52 is held in proper engagement withthe rollers and against any upward lifting movement by engagement of the surfaces 55 formed on the bracket 1 with the surfaces 56 formed on the slide 52, so that when the rollers 53 are properly adjusted by means of .theeccentric studs 54 in the taper attachment bracket l accurate guiding of the slide 52 in vertical relationship is provided without any lifting chattering or other distortion of this motion in the slide 52.

Horizontal displacement of the slide is taken care of by engagement of the anti-friction rollers 51 provided-on suitable eccentric studs 58 which engage the surfaces 59 of the slide 52 these rollers being carefullyad-justed to engage these surfaces so as to take care of all sidewise or hgizqnta st a sed. y e a r s tti g o he u debar' 4 1-.

The taper attachment slide 52 may be, actuated in differential movement that is movement at a predetermined'butdifierent rate than the relative rate of inovement of the carriage to the lathe bed, during taperturning or may be held stat on r elat ve he e o as to. have. the ame. a iv ve en h athe car iage h he; car a s heiat e b d.- The d ffere i l. el i mo men s .afie ed. by means. f h ed ack. pini n. sh t t0- itably i rna edfin bea n sfil. an e b acket l. he aper chme n has pin on. 63 redc sihn r end d nerat v v en ing thera k: fixed n. he bedihe. ot er end-o th szshe ti fl e e ds o wardl and has-c an e gea a raheem nt mpris n the. nuts 69anpropriately mounted on its end whereby suitable change gearing 65 may be inserted or removed rom he endo his. a t- Als i iq m l din the bracket I. f-the tap attachment is-thefian p att chment slide ack inion shatt 6! mo ted. on a p pr at ea in s 61 and 68 in this bracket l and, hasv a. rack. f on-6g; fixed on its inner end engagingthev raekflfl fixedtothe underside of the slide 52 by suitable screws 'H The outer end-of thiS shaft. 66 is also provided with a change gear ar-. rangement by means of the vnut connecting means 12 on which may be selectively mounted change gearing 13 in properengagementwith the, change gearing B5 on the, shaft 'Ifhe; pinions 63 and 69 are so.arranged' that; a simple selection of. change gearing. between. the shafts 611 and may result in. definite pre-dee termined relative movement of the slide 52;:with. respect to the lathe bed when the. carriageis 64 onthe. bed to drive th pinionfi3 and the-gear 55 to dri e. the. gear. 13; and thus the pinion 59 te-ydrive the slide 52-, during the. longitudinalmovement of theca-rriage along; the bed. By.

use of the relatively long-taper, attachment. guide he:

be eifected in the slide 52 with-relationto the for relatively long distances Witha high degree 76 z iitien r. nc z n ti e par s eo rmoved longitudina-lly; thereof causing the rack.

in conjunction with this; difierential; mechanism, a relatively highrate of travel-may.

ment of the taper bar with When it is desired to cut relatively slimlong :tapers this arrangement is provided with a brack- ,et74 which may be appropriately bound to the bedway B, as is usual in apparatus of this kind,

. tachment independent of the differential mechanism, the bracket 14 is locked to the bed so that it cannot move longitudinally of the Way'G to there- ,by hold the slide 52 in fixed relation with regard to the bed of the lathe during the operation of the carriage longitudinally thereof. In order to disconnect the differential mechanism from operative effect on this slide 52, it is merely necessary to pick off one of the change gears 65 or 13, so as to allow the shaft 60 free rotation without driving the shaft 66 as the carriage moves along the bed. When it is desired to utilize the lathe for ordinary turning the difierential change gears 65 and 13 are again disconnected by removing one or the other of these gears so that the shaft 65, while it rotates during longitudinal movement of the carriage along the bed, will have no effect in moving the slide 52.

In order that the slide 52 may not be moved during the normal turning operations on the lathe, means is provided for locking the shaft 66 against rotation in the bracket 1 of the taper attachment. This arrangement is best shown in Figure V and comprises a pair of bushings l! and 78, carried in a suitable bore 19 in the taper attachment bracket I. A wing screw passing through a bore 80, in the bushing 11 is threaded into the bore 8| of the bushing 18 and each of the bushings have arcuate surfaces 82 and 83 engaging the diameter portion 66a of the shaft 66, so that when the wing screw 84 is tightened to draw the bushings 11 and 18 toward each other, their respective arcuate surfaces 82 and 83 will be bound against the diameter portion 83 of the shaft 66 so as to prevent rotation of this shaft when the change gearing between shafts 60 and 5B is disconnected. In this Way the slide 52 is prevented from movement along the rollers 53 and 51.

Having thus fully set forth and described our invention what we claim as new and designed to secure by United States Letters Patent, is:

1. In a lathe, a bed, a carriage movable longitudinally on said bed, a taper attachment mounted on the carriage comprising a bracket, a guide bar slide carried by said bracket and movable relative to the carriage longitudinally of the bed, an angularly adjustable guide bar on said slide for actuating the cross slide on said carriage, a shaft journaled in said bracket, a pinion fixed on said shaft engaging a rack fixed on said bed, a second shaft journaled in said bracket, a pinion fixed on said second shaft engaging a rack fixed on said slide, gearing in said taper attachment interconnecting said shafts, means independent of said shafts for locking said slide to said bed, and means for disconnecting said gearing when said slide is locked to said bed.

2. In a lathe, a bed, a carriage movable longitudinally on said bed, a taper attachment mounted on the carriage comprising a bracket, a guide bar slide carried by said bracket and movable relative to the carriage longitudinally of the movement of said 'bed, an angularly adjustable guide bar on :said

slide for actuating the cross slide on said carriage, a shaft journaled in said bracket, a pinion fixed on said shaft engaging a rack fixed on said bed, a second shaft journaled in said bracket a pinion fixed on said second shaft engaging a rack fixed on said slide, gearing in said taper attachment interconnecting said shafts, means independent of said shafts for locking said slide .'.to said bed, means in said taper attachment for locking saidsecond shaft against rotation in said bracket to prevent movement of said slide when said gearing is disconnected;

3. In a, lathe, a bed, a carriage movable longitudinally on a said bed, a taper attachment mounted on the carriage'comprising a bracket, a guide bar slide carried by'said-bracket and movable relative to the carriage longitudinally of the bed, an angularly adjustable guide bar on said slide for actuating the cross slide on-said carriage, a shaft journaledin said bracket, a pinion fixed on said shaft engaging a rack fixed on said bed, a second shaft journaled in said bracket a pinion fixed on said second shaft engaging-a rack fixed on said slide, gearing in said taper attachment interconnectingsaid shafts, means independent of said shafts for locking said slide to said bed, means for disconnecting said gearing when said slide is locked to said bed, and means in said taper attachment for locking said second shaft against rotation in said bracket to prevent movement of said slide when said gearing'is disconnected and said slide is disconnected from said bed.

4. In a lathe, a bed, a carriage movable longitudinally on said bed, a taper attachment mounted on the carriage comprising a bracket, a guide bar slide carried by said bracket and movable relative to the carriage longitudinally of the bed, an angularly adjustable guide bar on said slide, a block slidably mounted in said bracket for movement cross Wise of said carriage, a guide bar shoe operating in said guide bar pivotally mounted on said block for sliding said block by slide, a. cross feed screw journaled against axial movement in said block and operating in a nut fixed on the cross slide of said lathe, a draw bar fixed to said cross slide and associated with said block, means for locking said draw bar to said block, means for rotating said cross feed screw when saiddraw bar is disconnected from said block, a shaft journaled in said bracket, a pinion fixed on said shaft engaging a said bed, a second shaft journaled in said bracket, a pinion fixed on said second shaft engaging a rack fixed on said slide, gearing insaid taper attachment interconnecting said shafts, means independent of said shafts for looking said slide to said bed, and means insaid taper attachment for disconnecting said gearing when said slide is locked to said bed.

5. In a lathe, a bed, a carriage movable longitudinally on said bed, a taper attachment mounted on the carriage comprising a bracket, 'a guide bar slide carried by said bracket and movable relative to the carriage longitudinally of the bed, an angularly adjustable guide bar on said slide,'a block slidablymounted in said bracket for movement cross wise of said carriage, a guide bar shoe operating in said guide bar pivotally mounted on said block for sliding said block by movement of said slide, a

operating in a nut fixed cross feed screw jour-.

naled agamst axial movement in said block and to said cross slide and :associated'with said block, means for locking said draw bar to said block, means for rotating said cross feed screw when said draw bar is disconnected from said block, :a shaft journaled in said Tbrac'ket, azpinion fixed on said shaft engaging a mackfixed on said :bed, a second shaft journaled in said bracket, a pinion fixed on said second shaiit engaging a rack fixed onsaidslide, gearing :in said .taper attachment interconnecting said ashafts, 'means independent of said shafts for looking said slide to said bed, means for locking said second shaft against rotation in said bracket to prevent movement of said-slide whensaid gearing is disconnected.

'6. Ina lathe, .a bed, a carriage movable longitudinally on said bed, a taper attachment mounted on the carriage comprising a bracket, a guide bar slide carried by said bracket and movable relative :to the carriage longitudinally of the bedxan angularly adjustable guide bar -on said slide,-ia blockslidably mounted in said bracket for :movement cross wiseofsa'id carriage, a guide bar shoe operating in saidgu'ide'bar pivotally mounted on said block for sliding said block-by movement of said slide, a cross feedscrew journaled against 7 axial movement in saidblock and operating in a nut fixed on the cross slide of said lathe, a draw bar fixed to said cross slide and associated with said block, means for locking said draw bar to said block, means for rotating said cross feed screw when said draw bar is disconnected from said block, a shaft journaled in said bracket, a pinion fixed on said shaft engaging a rack fixed on said bed, a second shaft journaled in said bracket, a pinion fixed on said second shaft engaging a rack fixed on said slide, gearing in said 

